[hpsdr] Pandora and FAN Noise

[Ed White WA3BZT]

Maybe we need to locate the type of fan used in the FLEX-5000A unit?
Ed
WA3BZT


Lyle Johnson wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> I had *terrible* fan noise in my unit after mounting the fan to 
> Pandora.  Today I had the opportunity to buy a couple of other fans, 
> mount them and listen to the fan noise and at the same time evaluate 
> the heatsink temperature on the LPU and on the LTC2208 on Mercury.
>
> The short version is that I found if I spaced the fan into the Pandora 
> enclosure by means of an 8-32 nut between the wall of Pandora and the 
> fan at each of the four fan mounting screw locations, the noise level 
> was reduced dramatically.
>
> I tried an ANTEC Tri-Cool 92 3-speed fan ($6.99 at Fry's).  It was OK 
> in the middle switch position.
>
> I also tried a Thermaltake "Smart Case Fan Blue LED" model A2017 
> ($14.99 at Fry's).  I set this up with the variable speed control and 
> found a setting that is very quiet when using the 8-32 nuts as 
> spacers.  Without the spacers it, too, was very noisy.
>
> I can now hear pileups on 20 meters using Mercury+Ozy+Atlas+LPU in 
> Pandora with an old amplifier computer speaker and KISS Konsole 1.01. 
> Before this, I had to listen to the fan...
>
> 73,
>
> Lyle KK7P
>
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